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    Debug delete bug 删除
    <input type="range">
    <script>
        // 1.Uncaught Referenceerror:引用错误,大部分都是变量或标识符不存在
        // console.log(a);
        // fn();

        // 2.Uncaught SyntaxError: Invalid or unexpected.语法错误:未发现的语法错误,违背js原则
        // var 1dsd**=10;

        // 3.Uncaught RangeError范围错误:输入的值,或者设置的值超出范围
        // var num=3.1415;
        // // console.log(num.toFixed(2));
        // console.log(num.toFixed(-2));

        // 4.TypeE;rror:类型错误
        1234()//Uncaught TypeError: 1234 is not a function



    </script>
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